99.9% Service Level Agreement

Google have announced a business version of their app
engine, which allows enterprise applications to be developed on the
scalable systems that lie behind Google applications.

App Engine for Business comes with an App Engine for Enterprise
Administration Console, which allows customers to keep tabs on all
the applications built by their company, regardless of whether
they’re the developer or not. The Console features Access Control
Lists for determining who has access to the application data and
the ability to deploy new code. SQL database is also supported, and
App Engine for Business customers can use Secure Sockets Layer on
their own domain for all App Engine applications.

App Engine for Business customers get access to premium
developer support, and a 99.9% Service Level Agreement. This
agreement is defined in the App Engine for Business SLA draft as Google pledging
to make the Google App Engine for Business service operational and
available for at least 99.9% of the time during the monthly billing
cycle. If this is not the case, the customer will receive Service
Credits.